CynicG

Look on the app it appears that you need to:

1. Plug the OBD-II reader in the port (make sure you have the ignition active I think but no need for the engine on necessarily). - IIRC it should flash like an Xmas tree for a bit.
2. Go to your iPad wifi setting and locate the ODB-II device. Click the little blue arrow to the right of the signal strength indicator
3. Under IP address click the 'Static' tab
4. The IP address assigned to the ODB-II reader will be visibile (eg. 192.168.0.something...)
5. Go back to the EngineLink app and input the IP address you just noted. I think you can leave the port as 35000. It may take a few seconds but you should be good to go.
6. If it still fails to connect, try resetting your network settings (IDevice: Settings > General > Reset (this will impact other things you connect to also such as your home wifi I expect))

EDIT: It looks like you have followed these instructions. Perhaps try the reset.

BenRNBP

In this video, he needs to go a few pages to the left and press the connect button to get the red to green indicator ( at 1 minute 20 seconds)

CynicG

Good call. I assumed he was clicking Connect but should have stated explicitly. That video is a good find Ben.

barreti

Seems I've got this little bugger working and with EngineLink.

Here are the settings for the reader I bought above connected to my iPad and for a 2008 car

Plug in the OBDII reader under the passenger side dash nearest the tunnel.
Switch on the ignition.
A light will be seen on the OBDII unit

On the iPad open Settings and WiFi
Search for WiFi_OBDII and connect to it. Then go into its settings by click on the I in a circle next to it.
You will have been given an IP address by the OBD unit which you need to make static.
Make a note of the numbers in IP Address, Subnet Mask, Router and DNS - mine are below for reference

Click halfway down the page on the box labelled Static and fill in the fields below
IP Address: 192.168.0.19
Subnet Mask: 255.255.255.0
Router and DNS both 192.168.0.10

Now fire up the app EngineLink
The only field I had to fill in was Adapter IP Address which was the same as Router and DNS : 192.168.0.10

Ensure WiFi and Metric boxes are checked at the bottom (blue boxes) and click Connect.
It should connect very quickly.
Swipe right and you should see it working.

barreti

While I was typing all that it seems you were trying to help me. Thanks BenRNBP and CynicG for your help.
My error code by the way was P0135 - the O2 sensor. I after all the reading I've done recently I think I might have guessed it was going to be this.

barreti

O2 sensor ordered from Honda for a whopping £241.90p

Lets hope it fixes the problem or I'm in trouble with Mrs B. ;-)